In the past to years, ever since moving back to my childhood smalltown, most of my friendly social interactions have been online. I've frequented message boards, like this one, I was very active in a chatroom, and I maintained a blog (which I have since deleted, started a new one but that didn't go anywhere.)
There were many evenings that I'd come home after work, and just spend hours chatting in the chatroom, about everything and nothing. I felt more appreciated on my online venues than in the real world.
While I have once more achieved a bit more of a balance between online and offline interactions, I still have no friends, and no frequent contacts in my phone list or mailbox. I'm not sure if it will ever change as long as I live.
I had two acquaintances in the early 2010s. I hung out with both a couple of times, but decided I preferred long stretches of being entirely alone, so I kept postponing the next meet-up until they both got sick and moved on.
If you want to change it, I'd say it's best to think about what you'd like to change and what you would expect from a possible friendship, and also what's hampering you in attenpting to establish such friendships. Some people feel comfortable in seeking contact based on mutual interests.
As for the friend you currently have infrequent contact with; it could help to reach out to them and plan some activity on a date when they're not busy. The thing is that often we think that a friendship will just keep going strong even if we don't see each other that much, but the truth is quite often that relations get less close when we're out of sight.
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clarity of thought before rashness of action